Key duplicating device



1952 w. T. LAWRENCE 2,619,713

KEY DUPLICATING DEVICE Filed May 11, 1949 Inventor Wilbur T. Lawrence WWW Patented Dec. 2, 1952 UNITED STATES PATENT OFFICE.

KEY DUPLICATIN G DEVICE Wilbur T. Lawrence, Baltimore, Md.

Application May 11, 1949, Serial No. 92,691

2 Claims.

The present invention relates to new and useful improvements in key duplicating devices and more particularly to a hand operated device of this character.

An important object of the invention is to provide a key duplicator in which a pattern guide and file are supported in spaced parallel relation to each other on a reciprocating handle for use respectively with a pattern key and a key blank and further to provide a swinging hanger supporting the inner end of the handle and by means of which the pattern guide and file are held at right angles to the key pattern and blank key.

A further object of the invention is to provide a reciprocating pattern guide and file supporting handle and a swinging hanger on which the inner end of the handle is pivotally and slidably supported to maintain the pattern guide and file at right angles to a pattern key and key blank while the pattern guide and file are advanced along the keys during the cutting operation of the file.

A further object of the invention is to provide a key duplicator of simple and practical construction, inexpensive to manufacture, efficient and reliable in operation and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a top plan view;

Figure 2 is a transverse sectional view taken on a line 2-2 of Figure 1;

Figure 3 is a longitudinal sectional view taken on a line 33 of Figure 1; and

Figure 4 is a fragmentary sectional view of one of the key holding vices taken on a line 4-4 of Figure 1.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention the numeral 5 designates a base plate of substantially rectangular-shape supported in an elevated position on a supporting surface by adjustable feet 6. A pair of L-shaped supports 1 are secured in an upstanding position at the rear side edges of base plate 5 by suitably attaching the lower ends of the supports under the base plate.

A U-shaped hanger 8 is swingably supported above base plate 5 by means of outwardly extending trunnions 9 journaled in the upper ends of supports 1. A U-shaped handle it, preferably of strap metal is provided with openings H at its ends for pivotally and slidably mounting the handle on the hanger 8.

A pattern guide bar 12 is secured to the outer side of one leg of handle in and parallel thereto by means of bolts and nuts or other suitable fasteners l3 and a file I4 is secured to the outer side of the other leg of handle [0 by means of clamping devices I5.

A pair of vises l6 and I1 are secured on the upper surface of base plate 5 at the front edge thereof, each vise including a stationary block I8 suitably secured to the base plate and a clamping block l9 secured in a clamping position relative to block l8 at the front edge of the latter by means of a thumb screw 20. A pattern key 2! is clamped in position in vise l6 and a blank key 22 is clamped in position in vise IT.

The keys are held in a uniform co-planar position by spacers 24 between the clamping blocks or jaws of the vises and providing shoulders 25 on which the lower edges of the keys rest.

A finger gripping knob 23 is' secured to the front or central portion of handle II].

In the operation of the device a pattern key 2| is secured in vise l6 and a blank key 22 secured in vise I! with the notches or serrations of the key projecting upwardly above the vises and the handle I!) moved into a position for engaging pattern guide I2 in one of the notches of pattern key 2| and the handle moved forwardly and rearwardly on swinging hanger 8 whereby a similar notch will be cut in blank key 22 by file M. The handle I 0 is slidable on hanger 8 to advance the pattern guide I2 and file I4 along the respective keys to form successive duplicate notches therein.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. A key duplicator comprising a base, a support rising from the base, a hanger, means pivotally mounting the hanger on the support for swinging movement in an are spaced from the pivotal axis, means on the base for holding a pattern key and a blank key in a fixed position, a handle pivotally and slidably suspended by the hanger for swinging movement endwise transversely of the keys, and a pattern guide and a cutting tool carried by the handle for respectively engaging the pattern key and the blank key and simultaneously movable transversely of said keys by endwise swinging of said handle.

2. A key duplicator comprising a base, a support rising from the base, a hanger, means pivotally mounting the hanger on the support for swinging movement in an are spaced from the pivotal axis, means on the base for holding a pattern key and a blank key in a fixed position. a U-shaped handle pivotally and slidably carried WILBUR T. LAWRENCE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 626,451 Alden et a1 June 6, 1899 749,598: West Jan. 12, 1904 2,167,341 Willock July 25, 1939 2,174,87 Errig et a1 Oct. 3, 1939 

